Road Bike

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Mountain Bike

What's New?

Is it New Bike Time? Always!
06/01/19- Don't waste another nice day on impulse power when you could be riding at Warp 9. Chain Reaction features the very best bikes from Trek & Electra, as well as the highest-quality travel bikes from Bike Friday. Road, Mountain, Hybrid, Electric assist, Kids... we've got them all. Probably the best selection in a single location you'll find anywhere on the peninsula too.
Got a bike that needs repairs?
If you purchased your bike from us, remember that you can bring it in anytime, without calling ahead, for minor on-the-spot adjustments of brakes, gears and wheels (at no charge; this is included with any bike purchased from us). For flat tires, again, no appointment needed. Where possible we try and do flat tires while you wait, but there will be times that's not possible. At most you will be leaving your bike overnight. For normal (bigger) repairs, calling ahead to schedule an appointment might make sense because the repair backlog has now gone to two weeks (???!!!) and we are struggling to deal with the backlog. This will unfortunately be the case at most shops known for high-quality service. Not helping matters has been the demise of several local bike shops (the most recent of which is Talbots Cyclery in San Mateo), which adds to the strain the remaining shops are feeling. 
It's E-Bike time at Chain Reaction! E-Bikes are the latest thing; find out why! Commute to the office without needing a shower, bring home the groceries (even if you live on top of a hill!) or keep up with your obsessive-cyclist partner. Prices start at just $1299 (Oyama folding E-bike) up to the incredible Trek Super Commuter 8 at $5199. They're not a secret anymore; everyone seems to have one. Find out why!

Disc Brakes for Road Bikes- Making the right choice

Disc brakes are the latest thing for road bikes. But are they the right choice for you? We discuss the trade-offs including benefits, cost, added weight and maintenance requirements.

Just a few of the bikes we sell. One of them is just right for you!

Trek Checkpoint AL 4
$1,469.99 $1,539.99 5% Savings
Checkpoint AL 4 is an ideal entry point to the world of gravel riding. It's...
Electra Townie Original 7D EQ Step-Thru
$609.99 - $649.99 $629.99 - $649.99 Up To 6% Savings
Lucky number 7 means gears a-plenty for most general riding. With a Shimano...
Trek FX 3 Disc
$769.99 $819.99 6% Savings
Fitness, simplified FX offers a best-of-both-worlds combination of road ...
Electra Loft 3i Step-Thru
$499.99 - $539.99 $539.99 Up To 7% Savings
Just enough gussy to get you up. The 3i is an all-weather, low-maintenance ...
Trek FX Sport 5 Women's
$1,799.99 $1,889.99 5% Savings
FX Sport 5 Women's is a carbon fiber fitness bike for riders who want the s...
Trek FX Sport 4
$1,149.99 $1,149.99 - $1,199.99 4% Savings
FX Sport 4 is where performance fitness bikes begin. A lightweight frame, 2...
Trek Marlin 5 Women's
$499.99 - $539.99 $539.99 Up To 7% Savings
Marlin 5 Women's is a trail-worthy daily rider that's perfectly suited for ...
Trek 920 Disc
$1,649.99 $1,999.99 18% Savings
When the pavement ends, 920 is just getting started. This rugged adventure ...
Trek Marlin 5
$499.99 $539.99 7% Savings
Marlin 5 is a trail-worthy daily rider that's perfectly suited for everyday...
Trek Checkpoint AL 3
$1,149.99 $1,199.99 4% Savings
Checkpoint AL 3 may be the introductory gravel bike in the lineup, but it's...
Trek Roscoe 7 Women's
$1,149.99 $1,199.99 4% Savings
Roscoe 7 Women's is a mid-fat trail hardtail for riders who favor a fun and...
Trek Domane SL 6
$2,549.99 - $2,799.99 $3,199.99 Up To 20% Savings
Key features - Front and Rear IsoSpeed decouplers smooth rough roads - ...